<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script src="../js/vue.js"></script>

<div id="app">

    <h2>当前计数：{{counter}}</h2>

<button v-on:click="add">+</button>
    <button v-on:click="sub">-</button>
<!--    //可以简写 成 @click-->
</div>


<script>

   const app = new Vue({
       el:"#app",
       data:{
           counter: 0
       },
        methods:{
           add:function (){
               this.counter++;
               console.log("add被执行");
           },
            sub:function (){
               this.counter--;
                console.log("sub被执行");
            }
        }

   })

</script>


</body>
</html>